I have installed the odoo 12 community on ubuntu 18.10 running apache2. The server is hosted on a Vultr vps. I have the DNS setup with NameCheap. The server run fine when I entered the following in the browser URL xxx.xxx.xxx.xxx:8069 (xxx.xxx.xxx.xxx say is my server ip). Then I set up the reverse proxy in apache2 so that the user can enter www.mysite.com or mysite.com without specifying the port ":8069" in the url.

The problem is that the website failed to load some time if I used www.mysite.com or mysite.com. But when I entered www.mysite.com:8069 or mysite.com:8069. It loaded every time without failure. I tried on Chrome, Firefox, Safari, Edge. The failure is more often on Firefox and Chrome.